What Is Ayanamsha and Which One Should You Use

If you've used more than one Vedic astrology app, you may have noticed something strange: your chart isn't quite the same in each of them. Not dramatically different — planets don't jump across multiple signs — but a planet near a sign boundary might be in different signs depending on which software you open. The Moon might be at 29° Pisces in one chart and 0° Aries in another. The ascendant might shift. When you go looking for why, you eventually find a setting buried somewhere: ayanamsha. You change it, and the chart changes.

This is not a bug. It is one of Jyotish's oldest, most genuinely unresolved questions.

The problem it solves§

The sky rotates. The Earth orbits. So far, everyone agrees. The complication is that the Earth's rotational axis wobbles on a cycle of about 25,800 years — a phenomenon called the precession of the equinoxes. As the axis traces its slow circle, the spring equinox — the moment the Sun crosses the celestial equator heading north — drifts against the background stars, moving backward through the constellations at roughly 50 arc-seconds per year.

Western astrology set its zero point at the spring equinox and kept it there. Every year, tropical Aries begins exactly at the equinox, regardless of where the actual stars are. The zodiac moves with the seasons.

Vedic astrology anchored its zero point to the fixed stars instead. Sidereal Aries begins near a specific part of the sky, and the zodiac stays put while the equinox point drifts away from it.

The ayanamsha is the size of that gap at any given moment in history. Right now it is approximately 23°50', depending on which value you use. To convert a tropical longitude to sidereal, you subtract the ayanamsha. To convert back, you add it. Simple arithmetic applied to an ancient disagreement.

Why there are so many values§

Here is where it gets complicated. Everyone agrees the precession is real and that a correction is needed. Nobody fully agrees on the exact size of that correction, because the answer depends on a prior question: where exactly did sidereal Aries begin?

The answer is not written in the sky. It was defined by the tradition — and different traditions, different scholars, and different historical moments produced different definitions.

Lahiri (Chitrapaksha) is the most widely used ayanamsha in India today. It was officially adopted by the Indian government's Calendar Reform Committee in 1955. Lahiri placed sidereal Aries such that the star Spica (Chitra) falls at exactly 180° — at 0° Libra. It's the default in most Indian software and the standard most professional Jyotishis in India use. For 2026, Lahiri gives approximately 23°51'.

True Citra is a modern astronomical refinement of the Lahiri concept. Rather than using a fixed value for Spica's position, True Citra continuously tracks Spica's actual position as measured by modern astronomy. The result is almost identical to Lahiri but fractionally more precise. Moonketu uses True Citra as its default — Spica is pinned to exactly 180° sidereal longitude, making the anchor explicit.

KP (Krishnamurti Paddhati) is a system developed by K.S. Krishnamurti, a 20th-century Indian astrologer who built his own system of sub-lords and cuspal analysis. His ayanamsha is close to Lahiri but slightly different, and it only makes complete sense within the KP framework. Don't use it unless you're working in KP specifically.

Raman was proposed by B.V. Raman, another influential 20th-century Jyotishi. His value is close to Lahiri but runs about 22' smaller. Some practitioners prefer it on philosophical grounds; it doesn't change most chart interpretations but can shift boundary cases.

Fagan-Bradley is the standard in Western sidereal astrology — a different tradition that also uses the sidereal zodiac but interprets it with Western methods. The value is roughly 0°45' smaller than Lahiri. Unless you are working specifically in Fagan-Bradley Western sidereal, this is not the ayanamsha for a Jyotish chart.

Yukteshwar was derived by Sri Yukteshwar Giri, the guru of Paramahansa Yogananda, based on his reading of the Surya Siddhanta. His value is significantly smaller — around 22°40' — and is associated with a different cosmological framework including a different theory of yugas. A fascinating minority position, not mainstream Jyotish.

What actually changes§

For most planets, most of the time, the choice of ayanamsha doesn't change the sign placement. The difference between Lahiri and Raman is under half a degree. A Saturn at 15° tropical Capricorn will be around 21°-22° sidereal Sagittarius regardless of which mainstream value you use.

The cases where it matters are edge cases — planets within about a degree of a sign boundary. If your Moon is at 0°30' Aries in the Lahiri chart, it may be at 29°50' Pisces in the Raman chart. Two different nakshatras, different emotional symbolism, potentially different dasha sequences. The sign changes. The interpretation shifts.

The lagna is even more sensitive because it moves so fast — about 1° every four minutes. A small difference in ayanamsha value can tip the ascendant across a sign boundary if it's near the cusp.

Which one to use§

Use Lahiri unless you have a specific reason not to. It is the Indian national standard, the most widely used by working Jyotishis, and the most common reference point when reading classical literature and modern commentaries. If a teacher or text refers to a planetary position without specifying the ayanamsha, they almost certainly mean Lahiri.

If you're learning from Moonketu, you're working with True Citra, which is effectively Lahiri with a continuously-updated astronomical anchor. For any planet not near a sign boundary, the results are indistinguishable.

Where this matters most practically: if you're consulting different practitioners or using different software, check the ayanamsha setting before wondering why your chart looks different. A one-degree difference can be enough to change how a trained Jyotishi reads a sensitive placement. It is worth knowing which chart you're looking at.

The full reference on ayanamsha — how precession works and a comparison table of values for the current year — is in the learn section. If the broader question of why Jyotish uses the sidereal zodiac at all is still open, start with Vedic vs Western Astrology — Why Your Sign Changes.